JP5197162B2 - Sheet conveying apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to a sheet conveying apparatus that conveys a sheet material such as recording paper in an image forming apparatus such as a printer.

  In general, an image forming apparatus such as a printer has a conveyance mechanism that conveys a sheet material and a skew correction mechanism that corrects the skew of the sheet material with respect to the conveyance direction.

  The transport mechanism includes a transport roller that is rotated by a driving source, and a pinch roller that is disposed to face the transport roller, sandwiches the sheet material, and is driven by the rotation of the transport roller, and rotates the transport roller. In this way, the sheet material is conveyed.

  Also, the skew feeding correction mechanism skews the sheet material with respect to the conveyance direction by abutting the front end of the sheet material against a registration roller, a registration shutter, or the like disposed upstream of the image forming unit in the conveyance direction of the sheet material. Is correcting.

  By the way, when the skewed sheet material is corrected for skew, the sheet material is twisted between the skew correction mechanism and the transport mechanism, and a rotational force M as shown in FIG. 7 is generated. For this reason, the sheet material after the skew correction sent to the image forming unit may be skewed again by the rotational force M.

  As shown in FIG. 7, in the conventional image forming apparatus, the transport rollers R1, R2, and R3 are supported on the rotation shaft C. The transport rollers R1, R2, and R3 are integrally attached to the direction around the rotation axis C, and are movably attached to the axis direction of the rotation axis C via coil springs S1 to S6. . In this image forming apparatus, the skew correction of the sheet material P is performed by abutting the front end of the sheet material P in the conveying direction against the registration roller A. Then, the thrust force F generated from the rotational force M due to the twist (distortion) of the sheet material P after the skew correction is eliminated by the transport rollers R1, R2, R3 moving in the axial direction of the rotational axis C. doing. Thereby, the rotational force M mentioned above is also eliminated, and the problem is solved.

  Further, the transport rollers R1, R2, and R3 moved by the thrust force F are urged by coil springs S1 to S6 from both sides in the axial direction of the transport rollers R1, R2, and R3, respectively. As a result, there is one configured to be able to return the transport rollers R1, R2, and R3 to predetermined positions (see Patent Document 1).

Further, in Patent Document 2, the amount of skew of a sheet material is measured by a sensor, and the amount of rotation of a pair of registration rollers arranged on both sides in the width direction orthogonal to the sheet material conveyance direction is changed, respectively. A configuration for correcting the skew is proposed. Further, in this configuration, the skew of the sheet material is corrected, and the conveyance roller arranged on the upstream side in the sheet material conveyance direction with respect to the registration roller is moved in the axial direction parallel to the width direction of the sheet material. The
Japanese Patent Laid-Open No. 2-18244 Japanese Patent Laid-Open No. 11-20993

  However, in the configuration of Patent Document 1 described above, since the plurality of conveyance rollers are always movable with respect to the axial direction of the conveyance shaft, the sheet material is abutted against the conveyance roller that performs skew correction of the sheet material. There has been a problem that the transport route to is not stable.

  Furthermore, in the configuration of Patent Document 1, since the conveyance roller is integrally provided in the rotation direction of the conveyance shaft, the twist of the sheet material is eliminated when the skew correction amount of the sheet material is relatively large. It may be insufficient to do. For this reason, in order to obtain a sufficient effect, it is necessary to slide the sheet material relative to the conveyance roller. However, on the other hand, in order to obtain a sufficient conveying force for conveying the sheet material, it is necessary to suppress slipping as much as possible, and it has been difficult to satisfy both conflicting conditions.

  Therefore, it is difficult to suppress the skew of the sheet material and reliably convey the sheet material, and in conveying during image formation, a difference in the left and right forces on both sides in the width direction of the sheet material and a disturbance in the conveyance distance occur. It was a factor. For this reason, there is a problem that color unevenness and density unevenness occur in an image recorded on a sheet material, particularly in an ink jet recording apparatus with high image quality.

  Further, in the configuration of Patent Document 2, it is necessary to provide a plurality of driving mechanisms for independently driving each of the sensor for detecting the skew of the sheet material and the plurality of conveying rollers, which increases the manufacturing cost. There was a problem that the size of the apparatus was increased.

  SUMMARY OF THE INVENTION Accordingly, the present invention provides a sheet conveying apparatus and an image forming apparatus that solve the above-described problems, suppress the skew of the sheet material that occurs after correcting the skew of the sheet material, and can convey the sheet material satisfactorily. The purpose is to provide.

In order to achieve the above-described object, a sheet conveying apparatus according to the present invention conveys a sheet material that is arranged downstream of the first conveying unit that conveys the sheet material and the conveying direction of the sheet material by the first conveying unit. and a second conveying means, it conveys the sheet material, skew correction lines bovine chromatography to correct the orientation of the sheet material by abutting the front end of the conveying direction of the sheet material to a second conveying means A conveyor system. The first conveying unit includes a conveying roller member that conveys the sheet material, a conveying shaft that supports the conveying roller member, a roller driving unit that rotationally drives the conveying shaft, and a roller that controls movement of the conveying roller member with respect to the conveying shaft. And a control mechanism. The roller control mechanism restricts movement of the transport roller member in the axial direction of the transport shaft when the transport roller member is at the first position with respect to the transport roller shaft, and when the transport roller member is at the second position. It is possible to move the transport roller member in the axial direction of the transport shaft within a predetermined range. When the conveying shaft is rotated by the roller driving unit, the conveying roller member moves to the first position, and after the skew feeding correction is performed, the conveying roller member is driven by the sheet material conveyed by the second conveying unit. As a result, the transport roller member moves to the second position.

  According to the present invention, the sheet material can be stably conveyed to the second conveying unit that performs the skew correction of the sheet material. In addition, according to the present invention, it is possible to suppress the distortion of the sheet material that occurs due to the skew correction of the sheet material, and the skew of the sheet material that occurs due to the distortion after performing the skew correction, the sheet It is possible to suppress the rotation due to the distortion of the material and the occurrence of unevenness in the feeding amount of the sheet material.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  A facsimile apparatus will be described as an example of an image forming apparatus using an inkjet recording method. The facsimile apparatus includes a sheet conveying device that conveys a recording sheet as a sheet material.

  FIG. 1 is a perspective view schematically illustrating a facsimile machine on which the sheet conveying apparatus according to the embodiment is mounted. FIG. 2 is a cross-sectional view schematically showing the facsimile apparatus, and FIG. 3 is a perspective view showing each roller constituting the recording unit of the facsimile apparatus.

  First, the recording unit D included in the facsimile apparatus will be described with reference to FIGS. The sheet conveying apparatus according to the embodiment includes a sheet feeding unit having two stages, an upper stage and a lower stage, and includes cassettes 18a and 18b capable of stacking and storing a plurality of recording sheets 2 as shown in FIG. Since the upper and lower sheet feeding units have substantially the same functions and configurations, only the upper sheet feeding unit will be described below.

  The cassette 18 included in the sheet conveying apparatus is detachably attached to the lower part of the sheet conveying apparatus. A pressure plate 3 for biasing the recording sheet 2 is provided inside the cassette 18. The pressure plate 3 is urged upward from the back surface by a pressure plate spring 4 disposed to face a paper feed roller 5 described later. Further, in the vicinity of the cassette 18, a separation claw 19 that is hooked at the front end in the conveyance direction of the recording sheet 2 is provided. Further, a paper feed roller 5 is disposed in the vicinity of the cassette 18, and the uppermost sheet in the recording sheet 2 stacked and stored in the cassette 18 by the cooperative action of the paper feed roller 5 and the separation claw 19. Only separate and feed.

  The paper feed roller 5 is formed in a half moon shape, and has an arc surface of the paper feed roller 5 that feeds paper in contact with the recording sheet 2 and a flat portion that faces the recording sheet 2 at a predetermined interval. Have. The paper feed roller 5 is in a state where the flat surface portion faces the recording sheet 2 during the paper feed standby.

  Further, the sheet conveying apparatus of the present embodiment is arranged downstream of the first conveying mechanism (first conveying means) for conveying the recording sheet 2 and the conveying direction of the recording sheet 2 by the first conveying mechanism. 2 and a second transport mechanism (second transport means). The sheet conveying apparatus of the present embodiment conveys the recording sheet 2, and the front end of the recording sheet 2 in the conveying direction is abutted against the second conveying mechanism so that one side of the front end of the recording sheet 2 is orthogonal to the conveying direction. As described above, the skew correction for correcting the orientation of the recording sheet 2 is performed.

  The first transport mechanism includes an intermediate transport roller 8 as a transport roller member that transports the recording sheet 2 and an intermediate transport roller shaft 25 as a transport shaft that supports the transport roller member. The first transport mechanism includes an intermediate transport roller drive mechanism (not shown) as a roller drive unit that rotationally drives the intermediate transport roller shaft 25, and the axial direction of the intermediate transport roller 8 with respect to the intermediate transport roller shaft 25 and about the axis. A roller control mechanism for controlling movement in the direction.

  The second transport mechanism includes a main transport roller disposed on the downstream side in the transport direction of the recording sheet 2 and a main transport roller driving mechanism (not shown) that rotationally drives the main transport roller.

  Further, at the time of feeding from the cassette 18, the recording sheet 2 is fed out by rotating once by a one-rotation clutch (not shown), and the recording sheet 2 is fed to an intermediate conveying roller 8 as a conveying roller member constituting the first conveying means. Hand over.

  Two intermediate conveyance rollers 8 are supported on the intermediate conveyance roller shaft 25 at a predetermined interval, and each intermediate conveyance roller 8 is located near both ends in the width direction perpendicular to the conveyance direction of the recording sheet 2. It is arranged to convey.

  An upstream conveyance roller roller 9 and a downstream conveyance roller roller 10 as driven roller members are pressed against the outer peripheral portion of the intermediate conveyance roller 8. The upstream transport roller roller 9 and the downstream transport roller roller 10 are supported so as to be movable in the direction of approaching and separating from the outer peripheral surface of the intermediate transport roller 8. The recording sheet 2 is conveyed toward the main conveyance roller 11 while being sandwiched between the intermediate conveyance roller 8 and the upstream conveyance roller roller 9 and the downstream conveyance roller roller 10 so as to be sufficiently wound around the outer periphery of the intermediate conveyance roller 8. The

  In the facsimile apparatus of the present embodiment, an ink jet recording method is used in which ink is ejected from an ink jet head (ink jet recording means) 17 as image forming means. As shown in FIG. 2, the recording unit D includes a carriage 31 on which the inkjet head 17 is mounted and reciprocally moves the inkjet head 17 in the width direction of the recording sheet 2, and a carriage drive mechanism (not shown) that drives the carriage 31. And have. The recording unit D is configured to record an image or the like by ejecting ink onto the recording sheet 2 by the inkjet head 17. In the facsimile apparatus of this embodiment, a reading unit 1 for reading the recording sheet 2 is arranged above the sheet conveying apparatus.

  The main transport roller 11 transports the recording sheet 2 transported from the intermediate transport roller 8 side to the ink discharge portion of the ink jet head 17 located on the downstream side in the transport direction, and ink droplets land at appropriate positions. It has a function of stopping the recording sheet 2 at the position.

  Further, in this sheet conveying apparatus, the role of a registration roller that corrects the skew of the recording sheet 2 by abutting one side of the front end of the recording sheet 2 conveyed from the intermediate conveying roller 8 against the main conveying roller 11, The main conveyance roller 11 also serves.

  The main conveyance roller roller 12 is pressed by the main conveyance roller 11, and is configured to nipping and conveying the recording sheet 2 following the rotation of the main conveyance roller 11.

  A first spur 14 is disposed downstream of the main transport roller 11 in the transport direction. The first spur 14 transports the recording sheet 2 after recording downstream in the transport direction. The first spur 14 is provided at a position facing the first paper discharge roller 13, and is a thin metal disk so that ink is not transferred even if it contacts the recording surface of the recording sheet 2. It is formed in a shape in which acute-angled protrusions are provided on the circumference. The first spur 14 presses the recording sheet 2 in the form of a dot at the tip of the protrusion, and follows the first paper discharge roller 13 to convey the recording sheet 2.

  In addition, a second paper discharge roller 15 and a second spur 16 are disposed downstream of the first paper discharge roller 13 and the first spur 14 in the transport direction. The second paper discharge roller 15 and the second spur 16 are configured in the same manner as the first paper discharge roller 13 and the first spur 14, and discharge the conveyed recording sheet 2 to the recording sheet discharge tray 21.

  The above is a schematic flow of the entire conveyance operation of the recording sheet. Since the main part of the present invention is the configuration and operation of the intermediate conveyance roller 8, the operation around the intermediate conveyance roller 8 will be described in detail below. To do.

  4, 5 and 6 are perspective views showing the operation of the intermediate transport roller 8 and its surroundings in the present embodiment.

  The intermediate transport roller 8 has a function of further transporting the recording sheet 2 delivered from the paper feed roller 5 and delivering it to the main transport roller 11. The main body portion of the intermediate conveyance roller 8 is formed in a substantially cylindrical shape by a resin material, and increases the frictional force of the outer peripheral portion to reliably convey the recording sheet 2, for example, formed by a rubber material or an elastomeric resin material. The conveyed rubber 8a is provided on the outer periphery.

  Further, the intermediate conveyance roller 8 is supported by an intermediate conveyance roller shaft 25 inserted through the shaft hole of the main body, and the direction around the axis (rotation direction) of the intermediate conveyance roller shaft 25 and the axial direction of the intermediate conveyance roller shaft 25. Each has a freedom of movement. A sleeve 8 b into which the intermediate conveyance roller shaft 25 is inserted is formed integrally with the intermediate conveyance roller 8 around the shaft hole of the intermediate conveyance roller 8.

  Further, the sleeve 8b is provided with a cam hole 8c as a cam portion with which the intermediate conveyance roller shaft 25 is engaged as a roller control mechanism. The cam hole 8c includes an isosceles triangular portion in which the movable range with respect to the axial direction of the intermediate transport roller shaft 25 gradually narrows in the rotational direction of the sleeve 8b when transporting the recording sheet 2, and the isosceles triangle. And a rectangular portion formed continuously at the bottom of the portion. Therefore, the cam hole 8c is formed as a pentagonal hole as a whole.

  As shown in FIG. 4, the inner peripheral portion of the cam hole 8 c is immovable by restricting the movement of the intermediate conveyance roller 8 in the axial direction of the intermediate conveyance roller shaft 25 at one end formed by the apex of the isosceles triangle portion. Has a first position P1. Further, the inner peripheral portion of the cam hole 8c is a second end that enables movement of the intermediate conveyance roller 8 in the axial direction of the intermediate conveyance roller shaft 25 within a predetermined range at the other end formed by one side of the rectangular portion. It has a position P2. That is, whether or not the intermediate conveyance roller 8 can move in the axial direction of the intermediate conveyance roller shaft 25 when the intermediate conveyance roller 8 is moved to the first position P1 and the second position P2 by the inner peripheral portion of the cam hole 8c. Is controlled.

  A spring pin 24 constituting a roller control mechanism is fixedly provided on the intermediate conveyance roller shaft 25, and the spring pin 24 is inserted into the cam hole 8c of the sleeve 8b. Since the spring pin 24 is engaged with the inner peripheral portion of the cam hole 8c, the degree of freedom of movement of the intermediate conveyance roller 8 is limited, and the intermediate conveyance roller 8 and the intermediate conveyance roller shaft 25 are relatively in a predetermined range. It is integrally configured with a degree of freedom of movement within.

  In such a configuration, when the recording sheet 2 is transported in the transport direction, the intermediate transport roller shaft 25 rotated by an intermediate transport roller drive mechanism (not shown) is rotated in the direction of arrow G in FIG. When the intermediate transport roller shaft 25 is rotated in the direction of arrow G, the spring pin 24 provided integrally with the intermediate transport roller shaft 25 hits the first position P1 of the cam hole 8c of the intermediate transport roller 8. It is applied and presses the inner peripheral end of the cam hole 8c.

  As described above, the cam hole 8c is formed in a cam shape whose width becomes narrower in the rotation direction when the recording sheet 2 is conveyed in the conveyance direction. Therefore, the intermediate conveyance roller 8 moves in the axial direction following the cam shape of the cam hole 8c, and the spring pin 24 is in contact with the first position P1 of the cam hole 8c as shown in FIG. Is fixed to the intermediate conveyance roller shaft 25 and rotates integrally with the intermediate conveyance roller shaft 25.

  Further, the upstream conveying roller roller 9 and the downstream conveying roller roller 10 are pressed against the outer peripheral surface of the intermediate conveying roller 8, and the recording sheet 2 delivered from the paper feeding roller 5 is transferred to the intermediate conveying roller 8 and each conveying roller roller. 9 and 10. For this reason, the recording sheet 2 is conveyed with the rotation of the intermediate conveying roller 8, and the front end of the recording sheet 2 reaches the main conveying roller 11.

  At this time, even when one side of the front end of the recording sheet 2 is not oriented at right angles to the conveyance direction, one side of the front end of the recording sheet 2 is abutted against the outer peripheral surface of the main conveyance roller 11, One side of the front end of the recording sheet 2 is corrected in a direction orthogonal to the conveyance direction. That is, in this embodiment, the main transport roller 11 has a skew correction function that also functions as a registration roller.

  Then, the main transport roller 11 is rotated by a main transport roller driving mechanism (not shown), and the recording sheet 2 is sandwiched between the main transport roller 11 and the main transport roller roller 12, and then the intermediate transport roller driving mechanism performs intermediate processing. The rotational driving of the transport roller 8 is stopped and the idle roller is brought into an idle state.

  At this time, since the recording sheet 2 is sandwiched between the intermediate conveying roller 8 and the conveying roller rollers 9 and 10, the rear end of the recording sheet 2 remains skewed with respect to the conveying direction. Accordingly, the recording sheet 2 is twisted, and the conveying force is applied unevenly to both sides of the recording sheet 2 in the width direction.

  Thereafter, when the conveyance operation of the recording sheet 2 is continued along with the rotation of the main conveyance roller 11, the intermediate conveyance roller 8 is rotated by the movement of the conveyance of the recording sheet 2, and the “following” state is established. Become. Here, there is a gap between the spring pin 24 and the inner peripheral portion of the cam hole 8c, that is, the distance between the first position P1 and the second position P2 of the cam hole 8c is larger than the diameter of the spring pin 24. Has also been enlarged. For this reason, when the intermediate conveyance roller 8 is rotated, the intermediate conveyance roller 8 first starts rotating before the intermediate conveyance roller shaft 25.

  As the intermediate conveyance roller 8 rotates about the axis with respect to the intermediate conveyance roller shaft 25, the first position P1 of the cam hole 8c is separated from the spring pin 24 as shown in FIG. Therefore, the intermediate conveyance roller 8 is within the range of the inner peripheral portion of the cam hole 8c, and is relatively free from the intermediate conveyance roller shaft 25 in the direction around the axis (rotation direction) and the degree of freedom in the axial direction. Get each.

  As described above, two intermediate transport rollers 8 are provided on one intermediate transport roller shaft 25, and each of the two intermediate transport rollers 8 independently obtains a degree of freedom of movement. For this reason, due to the twist generated in the recording sheet 2, the two intermediate transport rollers 8 are independently moved by the unequal forces generated on both sides (left and right) in the width direction of the recording sheet 2, It is possible to eliminate the twist generated in the recording sheet 2.

  Further, the upstream conveyance roller roller 9 and the downstream conveyance roller roller 10 are supported by an intermediate roller shaft 23 so that the shaft hole can move in a direction parallel to the axial direction of the intermediate conveyance roller shaft 25. Further, return means for returning the respective conveying roller rollers 9 and 10 to predetermined positions in a direction parallel to the axial direction of the intermediate conveying roller shaft 25 on both side surfaces in the width direction of the recording sheet 2 of the respective conveying roller rollers 9 and 10. The intermediate roller springs 22 are in contact with each other and biased. Therefore, each of the transport roller rollers 9 and 10 is configured to be able to follow the movement of the intermediate transport roller 8 in the axial direction of the intermediate transport roller shaft 25.

  Thereafter, when the recording sheet 2 is further conveyed by the main conveying roller 11, the spring pin 24 reaches and engages with the second position P2 of the cam hole 8c as shown in FIG. 8 rotates with the intermediate conveyance roller shaft 25.

  At this time, since the twist generated in the recording sheet 2 has already been eliminated, the recording sheet 2 is fed into the recording unit D with a stable conveying operation without exerting an unequal force on the main conveying roller 11. be able to.

  When a series of recording operations is completed and the next recording sheet 2 is transported, the intermediate transport roller 8 and the intermediate transport roller 8 are moved by the cam operation between the spring pin 24 and the inner peripheral end of the cam hole 8c as described above. The relative positional relationship with the intermediate conveyance roller shaft 25 returns to the original position. Therefore, the intermediate conveying roller 8 does not remain in a position offset with respect to the axial direction of the intermediate conveying roller shaft 25, and the effect can be maintained even if the paper feeding operation and the conveying operation are repeated.

  According to this embodiment, the recording sheet can be stably conveyed to the main conveyance roller that performs skew correction of the recording sheet. In addition, according to the present embodiment, it is possible to suppress the distortion (twist) of the recording sheet 2 that occurs due to the skew correction of the recording sheet. For this reason, after the skew correction of the recording sheet 2, the skew of the recording sheet 2 caused by this distortion, the rotation due to the distortion of the recording sheet 2, and the occurrence of uneven feeding amount of the recording sheet 2 can be suppressed. . Therefore, according to this embodiment, it is possible to obtain a high-quality output image with reduced color unevenness and density unevenness. Further, in this embodiment, since the roller control mechanism that controls the movement of the intermediate conveyance roller 8 can be configured relatively simply, the space occupied by the roller control mechanism can be kept relatively small without increasing the manufacturing cost. And sufficient effects can be obtained.

  In the above-described embodiment, the configuration and the transport operation have been described using the upper sheet feeding unit and the transport unit. However, the lower sheet feeding unit is configured in substantially the same manner.

  Further, the present invention is not limited to this embodiment, and transports the transported object across the transport roller disposed on the upstream side in the transport direction of the sheet-shaped transported object and the transport roller disposed on the downstream side. The present invention may be applied to a sheet conveying apparatus having a configuration for correcting skew feeding of a conveyed object between the conveying rollers.

1 is a perspective view illustrating a facsimile machine on which a sheet conveying device according to an embodiment is mounted. 1 is a cross-sectional view illustrating a facsimile machine on which a sheet conveying device of an embodiment is mounted. FIG. 4 is a perspective view illustrating a main conveyance roller, an intermediate conveyance roller, and a paper feed roller in the sheet conveyance apparatus of the embodiment. It is a partial enlarged view for explaining an intermediate conveyance roller in an embodiment. It is a partial enlarged view for explaining an intermediate conveyance roller in an embodiment. It is a partial enlarged view for explaining an intermediate conveyance roller in an embodiment. FIG. 10 is a schematic diagram for explaining a configuration for performing skew correction and a configuration for correcting the twist of a sheet material due to skew correction in a conventional inkjet recording apparatus.

Explanation of symbols

2 recording sheet 8 intermediate transport roller 8b sleeve 8c cam hole 9 upstream transport roller roller 10 downstream transport roller roller 11 main transport roller 24 spring pin 25 intermediate transport roller shaft P1 first position P2 second position

Claims (7)

A first conveying unit that conveys the sheet material; and a second conveying unit that is arranged downstream in the conveying direction of the sheet material by the first conveying unit and conveys the sheet material. conveys, skew correction for correcting the orientation of the sheet material by abutting the front end of the conveying direction of the sheet material to said second conveying means a row bovine over preparative conveying device,
The first conveying unit includes a conveying roller member that conveys the sheet material, a conveying shaft that supports the conveying roller member, a roller driving unit that rotationally drives the conveying shaft, and the conveying roller member with respect to the conveying shaft. A roller control mechanism for controlling the movement of
The roller control mechanism restricts movement of the transport roller member in the axial direction of the transport shaft when the transport roller member is at a first position with respect to the transport roller shaft, and the transport roller member Enabling movement of the transport roller member in the axial direction of the transport shaft within a predetermined range when in the position,
When the conveyance shaft is rotated by the roller driving unit, the conveyance roller member moves to the first position, and after performing the skew correction, the sheet conveyed by the second conveyance unit. The sheet conveying apparatus , wherein the conveying roller member is moved to the second position when the conveying roller member follows the material . The roller control mechanism includes a cam portion that is provided on the conveyance roller member and engages the conveyance shaft, and the conveyance roller member is moved to the first position and the second position by the cam portion. The sheet conveying apparatus according to claim 1 , wherein movement of the conveying roller member with respect to an axial direction of the conveying shaft when being performed is controlled. The first transport unit includes at least two transport roller members provided on the transport shaft, and each of the transport roller members is independent of the axial direction of the transport shaft within the predetermined range. are movable Te, the sheet conveying device according to claim 1 or 2. The first conveying means has a driven roller member that is pressed against the conveying roller member and sandwiches the sheet material,
The driven roller member is provided so as to be movable in a direction parallel to the axial direction of the transport shaft, and is provided with return means for returning the driven roller member to a predetermined position in the parallel direction. The sheet conveying apparatus according to any one of 1 to 3 . The sheet conveying apparatus according to claim 4 , wherein the driven roller member is supported so as to be movable in a direction of approaching and separating from an outer peripheral surface of the conveying roller member. A sheet conveying apparatus according to any one of claims 1 to 5 , and an image forming unit disposed downstream in the conveying direction of the sheet material with respect to the second conveying unit,
The image forming apparatus is configured to form an image on the sheet material by reciprocating in a direction orthogonal to a conveying direction of the sheet material by the sheet conveying device. The image forming apparatus according to claim 6 , wherein the image forming unit is an inkjet recording unit.

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